Abstract
A microtomography beamline has been recently assembled and is currently operating at the Louisiana State University’s Center for Advanced Microstructures and Devices synchrotron (CAMD). It has been installed on a bending magnet white-light beamline at port 7A. With the storage ring operating at 1.5 GeV, this beamline has a maximum usable x-ray energy of ∼15 keV. The instrumentation consists of computer-controlled positioning stages for alignment and rotation, a CsI(Tl) phosphor screen, a reflecting mirror, a microscope objective (1:1, 1:4), and Linux/LabVIEW-controlled charge coupled device. With the 1:4 objective, the maximum spatial resolution is 2.25 μm. The positioning and image acquisition computers communicate via transfer control protocol/internet protocol (TCP/IP). A small G4/Linux cluster has been installed for the purpose of on-site reconstruction. Instrument, alignment and reconstruction programs are written in MATLAB, IDL, and C. The applications to date are many and we present several examples. Several biological samples have been studied as part of an effort on biological visualization and computation. Future improvements to this microtomography station include the addition of a double-multilayer monochromator, allowing one to evaluate the three-dimensional elemental composition of materials. Plans also include eventual installation at the CAMD 7 T wiggler beamline, providing x rays in excess of 50 keV to provide better penetration of higher mass-density materials.
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